Im looking for a vocal harmonizer that wont break the bank. Checked out the TC Helicon, but reviews said you have to change the key every song. I play bass, and also the lead singer. I need something like a pedal to work with while playing. My drummer and guitarist cant sing that well. Im looking for something I can control from song to song without setting the key after every song. Also don't want to pay 500. Any ideas. Thanks.